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一、引言 Fe-Cr-Ni-Mo系奥氏体和双相不锈钢是常用的耐蚀材料。关于合金元素Cr和Mo对不锈钢点腐蚀和缝隙腐蚀等局部腐蚀行为的影响,已有不少研究和评述,而关于Ni在局部腐蚀中的作用。研究报导还比较少。我们曾采用实验电位-pH图较系统地研究了Fe-Cr-Mo系铁素体不锈钢的局部腐蚀行为以及Cr和Mo对钢的局部腐蚀的萌生和发展的影响。但关于Fe-Cr-Ni-Mo系奥氏体或双相不锈钢在含氯离子介质中的实验电位-pH图报导还比较少。为了研究合金元素Cr、Ni、Mo在钢的局部腐蚀,特别是点蚀中的作用,冶炼了含17%Cr和25%Cr两个系列的Fe-Cr-Ni-Mo不锈钢14种(17Cr-XNi-yMo,其中X=8～
I. INTRODUCTION Fe-Cr-Ni-Mo austenitic and duplex stainless steels are common corrosion-resistant materials. There have been many researches and reviews on the effects of alloying elements Cr and Mo on localized corrosion such as point corrosion and crevice corrosion of stainless steel, but also on the role of Ni in localized corrosion. Research reports are still relatively small. We have used the experimental potential-pH diagram to systematically study the local corrosion behavior of Fe-Cr-Mo ferritic stainless steel and Cr and Mo on the local corrosion of steel initiation and development. However, there is still little report about the experimental potential-pH in Fe-Cr-Ni-Mo austenitic or duplex stainless steel in chloride-containing media. In order to study the effect of alloying elements Cr, Ni, Mo on local corrosion of steel, especially pitting corrosion, 14 kinds of Fe-Cr-Ni-Mo stainless steel containing 17% Cr and 25% XNi-yMo, where X = 8 ~